Sintering apparatus



April 14, 1925. 1,533,109

J. E. GREENAWALT v smmnme APPARATUS Filed March 21. 1923 4 Sheets-Sheet 1 mm (75/37) 5 Ga f/mm I &' #W

April 14, I925. J. E. GREENAWALTV SINTERING APPARATUS Filed March 21. 1923 Mew: do? 5 Gea /mm; 7."

4 Sheqcs-Sheet 2 April 14, 1925. 1,533,109

J. E. GREENAWALT SINTERING APPARATUS Filed March 21, 1923 4 Sheets-Shoot 5 Ja /r 1 694-50212442- April 14, 1925.

1,533,109 J. E. GREENAWALT SINTERING APPARATUS Filed March 21, 1922s 4 sheets -sheet 4' Mew: (7517/7 5 6955041144 7:

Patented Apr. 14, 1925.

UNITED STATES JOHN E. emmnawam, or new ronx, n. Y. sm'rsnmc 2m Applicationflled larch 21, 1983. Serial 110. 626,668.

To all whom it may concern:

Be it known that I, J OHN EQGREENAWALT,

a citizen of the United States, residing at New York, in the county of New 'York and State of New York, have invented certain new and useful Improvements in Sintering Apparatus, of which the following is a specification.

My invention has relation to improvements in sintering a paratus and is directed to themethod of an apparatus for igniting the char e of material to be treated. Heretofore I ave used an igniting hood wherein there are a plurality of burners from which the fuel is projected under pressure in the form of a circular sheet to simultaneously ignite the surface of the charge. Examples of this method of igniting the charge may be found in my United States Patent N 0. 1,084,939,, and my co ending application Serial No. 626,669 file March 21, 1923. However, this method, although satisfactory, involves the supplying of the fuel to the burners under considerable pressure (about forty pounds) and also requires a specially constructed burner, such as in the patent and application aforesaid.

. The method of. ignition about to be described in the present application re uires no special burner and may be carried out with gaseous fuel at a low pressure. The

gas supplied by commercial companies (at a pressure of approximately one pound) may'be used with. good results. Therefore, one of the objects of the present invention is to provide'a method of and. a paratus for ignitm material to be sintere with com mercia gas as a fuel, or some other suitable fluent fuel at a low pressure, since powdered coal would sufiice; a further object is to obtain satisfactory igniting with a simple burner such as a perforated pipe; a still further object is to accomplish simultaneous ignition over a large surface by projecting a plurality of small jets of flame against said surface, Further .and other advantages will be better apparent from a detailed description of the invention'in connection with the accompanying drawings, in which Figure 1 is a top plan of my improved ignition apparatus with parts of the hood roof omitted; Fig. 2 is a side elevation of the apparatus with part in section; Fig. 3 is a transverse section through the apparatus on the line 33 ofFig. 2; Fig. 4 is a to plan of the burner with part of the fue pipe broken away;

Fig. 5 is an enlarged cross-sectlonal detail through the burner on the line 5-5 of Fig. 3; Fig. 6 is an enlarged crosssectional detail through the burner on the -l1ne 66 of Fig. 3; ig. 7 isan enlarged cross;sect1onal detail through the burner on the l1ne 77 of Fig. 3; Fig. 8 is a side elevationof about one-half of a modified form of apparatus wherein a fuel and air premixmfidevice is used.

eferring to the drawin present to Figures 1 to 7 inc usive, H represents the igniting hood of the apparatus adapted to be placed over a sintering pan P containing a charge of material m to be treated, saidpan havingcommunication with an exhauster (not shown) connectedtoopenings A in each end of the an, as-is well understood in the art. Said ood H comprises a supporting frame 1, a plurality of cromroof frame members 2 restlng on and-secured PATENT OFFICE.

and for the to said frame 1, and a plurality of burners 3, each of which is supported roofframe members 2, 2 which are spaced to receive the burners. frame 1 carries a sealing frame 4 whic forms the. subject-matter'ofmy copending application Serial No. 626,667 filed March 21, 1923, and will not here be described further.

There aretwo burners 3, 3 supported between every two adjacent roof members 2, 2, said burners constituting a part of the hood H and extendmg from each side of the pan to the middle ig. 3). Supported in said burners on saddles 5 are fuel pipes 6, each of which is connected by a branch 7 to a manifold 8, the latter being adapted to be connected to a fuel supply main (not shown) by a swing pipe 9 connected to the manifold by the stuifing boxes 10, 10. The manifold 8 is supported through a standard 11 and block 12 by channels 13, 13, said channels being supported by brackets 14, 14 formed on the sides of frame 1. The entire apparatus is supported b wheels 15 mounted on axles 16 ournals. in bearings 17 on the frame 1.

The fuel pipes 6 are each provided with a series of outlet openings 0 for the fuel, said openings extending along the entire length of the pipes alternately on one side and then the other thereof. The burners 3 are U-shaped in cross-section and are provided with flanges .18, 18 along their upper edges 'which rest by adjacent The supporting upon. ledges 19, 19 formed on the lower edges of adjacentroof members 2. Each burner 3 has pair of lugs 20, formedon its upr ed es and adjacent each end thereof, sald ugs projecting inwardly and serving as an abutment for blocks 21, 21 which, together with set screws 22, of' which one is screwed through each block and against the p1pe 6 within the burner, maintain theplpe 6 in place on the saddles 5. The burners.3 are each provided with a series of bosses 23.

formed on the inside thereof alternately from side to side along the entire length of the burner, and traversing the bossesare openings o' registering with pipe openings 0 to form the outlet for the fuel. It Wlll be observed that there is a slight space a between the pipe 6 and inner face of bosses 23, the object of which is to permlt atmospherlc air to come down into the burner (which is open at the to and mix with the fuel as it comes from t e opening 0, the mixed fuel and air discharging into the hood chamber 6 through openings 0'. The jet of gas 1ssu ing from each opening 0 acts as an in ector in drawing air through opening 0 with 1t. At the middle of burner 3 where pipe sections 6, 6 are connected tobranch 7 y the T 7 the boss 23' must needs be thinner than surface of the charge m in the sin-tering pan P, so that the jets of flame issuing from the burners will be projected downwardly against the charge. Since the jets are pro- 'ected diagonally against the charge they ave sufliclent length to enlarge and spread out, each jet thus furnishing a larger'flame to be drawn downwardly-than if they were projected perpendicularly against the charge. Then too, the downward draft through the charge will be effective on the entire length of the flame jet. By virtue of the above disposition of the jets t eir cumulative effect, when acted upon by the draft,

is to simultaneously ignite the entire surface of the charge.

After the hood H has been positioned over the pan P and thesealing frame 4 lowered to shutoff crow-currents from the charge, the swing ipe 9 is connected to the gas supply m-ain in any suitable manner) thus providing the burners with gas. As the jets of gas issue from the openings 0 they will induce air to flow downwardly through spaces a, s forming a combustible fuel mixture which issues from openings 0. The draft is then caused to move downwardly through the charge by the exhauster (not shown) and the fuel jets ignited. Thedownward draft will augment the air flow through the openings 0 so that there will bea plentiful supplly of oxygen to support the combustion While in the present case a hood is provided to form an igniting chamber C, this hood (as such) may be dispensed with, leafmg open the entire space above the charge except for the burners. The reason that hood is not needed in .the present method of lgniting the charge is because the flame jets from t e large number of burner openings are projected against the entire surface of v the charge instead of filling the igniting chamber with flame as is the casein my patent aforesaid. v

Referring to Fig. 8, I show an igniting apparatus of which the manifold 30 for su P burner pipes, with fuel, is connected at 32 with a gas and air mixing device well known in the art (a Maxon premix being preferred) for premixing the fuel with air before it enters the burners. The gas enters the premixer through a pipe 33, and the air enterin through intake openings 34, -the two being thoroughly mixed within the housin 35 from which the mixture is discharge into manifold 30. In all otherjrespects this igniting apparatus is similar to that of the main form previously described. Having described my invention, I claim: 1. The method of i niting a charge of material to be s'intere which consists in projecting a plurality of flame jets diagonally toward the charge and simultaneously therewith subjecting the charge to the action of an exhauster whereby the flame from the j'ets will-be drawn against the surface of said charge.

2. The method of i niting a charge of material to be sintered, which consists in pro'ecting a plurality of flame jets diagonal y toward the char e from a suflicient I distance to permit sai jets to spread into each other, and simultaneously therewith subjecting the charge to the action of an exhauster. I

3. In an igniting apparatus for material to be treated, a burner and afuel pipe therein, said burner and fuel pipe having registering outlet openings, the openings in the burner being diagonally inclined toward the.

surface of the charge.

4. In an ignitin I apparatus for material to be sintered, a urner and a fuel ipe therein, said burner and fuel pipe each avying the branches 31, which lead tot e ing a plurality of outlet 0 nings in registerin relation and extendi ng along their lengt on both sides, the openings in the burner being diagonally inclined toward the surface of the charge. I

5. An igniting device for material to be treated comprising a frame and a plurality of burner members mounted on said frame, said members being elongated and substantially U-shaped in cross-section, a fuel ipe disposed within the burner member a ong its longitudinal axis, means for supplying fuel to said pipe, said member and pipe having registering outlet openin s, and means for securing the pipe in space relation with the burner.

6. An device for material to be treated com rising a hood, said hood embodying a p urality of burner members and roof members,'said burner members having fuel pipes therein, the burner members and fuel pi es having registering outlet openin s, an means for permitting the passage o atmospheric air through the burner member tothe burner outlet.

7.- An igniting device for material to be treated comprising a hood, said hood being composed of a frame and a plurality of roof members supported thereby, some of said roof members constituting burners, the

burners having fuel i s therein and spaced 7 E P therefrom, and the urners and pipes having registering outlet openings for the fuelmixture.

In testimony whereof I hereunto afiix my signature; 

